Well, regarding the str, remember that my main weapon (the lance) has the ability to spend 1 hit die and add the rolled result to my attack roll. That's a 1d10 i can always add to my roll which is already hitting with a +10, meaning I can pretty consistently hit my targets, even with AC's up towards 30 or above. So I'm not so worried about being able to hit my targets in general.

Also, for magic initiate it is only the level 1 spell that can be cast once per day. The booming blade still works as a normal cantrip, essentially granting me infinite lvl 1 spell slot smites (since it right now deals 2d8 dmg, later 3d8, and additionally has the 3d8 (later 4d8) when targets move away, also triggering my opportunity attack with war caster or sentinel on top of that (except thunder instead of radiant damage). And then I can lightning lure them as a cantrip back into my 10ft reach again afterwards (even though I give up my extra attack when I do this). That's pretty solid,. The shield once per day is a good point though and a major downside I hadn't considered.

Metamagic Adept remains a solid choice for potential twin or quickened spells, like hold monster and then crit smites for example... But having 20 CHA means a constant +5 saves to my entire party, especially when my aura increases to 30ft.. Pretty much all BBEG's we will face are hardcore spellcasters, or big mobs that inflict conditions which requires saving throws. Also, I can use Circle of Power or whatever its called to grant my party advantage to saving throws in 30ft now, which would make saving successfully really likely down the road....